問題詳情

5.A very long solenoid, consisting of n closely wound turns per unit length on a cylinder of radius R and carrying a steady current I.
【題組】(a)Find the magnetic Field of the solenoid. (5%)

參考答案

答案：D
難度：簡單0.8
統計：A(5),B(28),C(26),D(312),E(0)